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### Question Asked by a Student from EXXAMM.com Team

** Q 1287312287. ** Equation of motion of a point in space is `x = 2t, y = -4t, z = 4t` where `t` measured in hours and the co – ordinates of moving point in kilometers. The distance of the point from the starting point `O (0, 0, 0)` in `10` hours is